I recently needed to do the same thing where I used the pointdist() expression to get the uv position but I was using this on ~300k points which took about 30 min to calculate.
I ended up using a point cloud to get the uv position instead and it droped my calculation times down from 30min to about 1 min. So if you are using loads of points I would recommend a point cloud.
----- Original Message -----
From: "François Duchesneau" <sidefx at trinix.ca>
To: sidefx-houdini-list at sidefx.com
Sent: 15 January 2008 21:56:53 o'clock (GMT-0500) America/New_York
Subject: Re: [Sidefx-houdini-list] Access nurbs parametric uvs
Thanks to FrankFirsching on the odForce forum who answered my question
one year before I asked it ;)
Now it works with the expressions pointdist combined with unituv.
François
François Duchesneau wrote:
> Hi, I'm trying to do my own curve projection on a nurbs surface because
> I cannot make the Project Sop to work. It always breaks my projected
> curve in many segments.
>> What I need for that is access the parametric nurbs uv that correspond
> to the isoparm because uvprim expression is reading that, not the
> shading uv. Is there an operator that creates that or is it a global
> variable?
>> François
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